After her nanny's supposed death, Katharine McPhee departs David Foster's tour early.

– Katharine McPhee and David Foster's nanny passed away; no cause disclosed.

– McPhee called it a "horrible tragedy" in a social media post.

– The couple, wed in 2019, have a 2-year-old daughter, Rennie.

– McPhee canceled Asia tour, citing the family crisis.

– Well-wishes poured in from friends and followers online.

– Foster will perform the final Hitman Asia tour show.

– McPhee previously expressed excitement about the Asia tour.

– Foster's show to feature artists like Michael Bolton and Raisa.

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